public bool ReceiveFromAsync(SocketAsyncEventArgs e)
{
if (NetEventSource.IsEnabled) NetEventSource.Enter(this, e);
bool retval;
if (CleanedUp)
{
throw new ObjectDisposedException(GetType().FullName);
}
if (e == null)
{
throw new ArgumentNullException(nameof(e));
}
if (e.RemoteEndPoint == null)
{
throw new ArgumentNullException("RemoteEndPoint");
}
if (!CanTryAddressFamily(e.RemoteEndPoint.AddressFamily))
{
throw new ArgumentException(SR.Format(SR.net_InvalidEndPointAddressFamily, e.RemoteEndPoint.AddressFamily, _addressFamily), "RemoteEndPoint");
}
SocketPal.CheckDualModeReceiveSupport(this);
// We don't do a CAS demand here because the contents of remoteEP aren't used by
// WSARecvFrom; all that matters is that we generate a unique-to-this-call SocketAddress
// with the right address family.
EndPoint endPointSnapshot = e.RemoteEndPoint;
e._socketAddress = SnapshotAndSerialize(ref endPointSnapshot);
// DualMode sockets may have updated the endPointSnapshot, and it has to have the same AddressFamily as
// e.m_SocketAddres for Create to work later.
e.RemoteEndPoint = endPointSnapshot;
// Prepare for the native call.
e.StartOperationCommon(this);
e.StartOperationReceiveFrom();
// Make the native call.
SocketFlags flags;
int bytesTransferred;
SocketError socketError;
try
{
socketError = e.DoOperationReceiveFrom(_handle, out flags, out bytesTransferred);
}
catch
{
// Clear in-use flag on event args object.
e.Complete();
throw;
}
// Handle completion when completion port is not posted.
if (socketError != SocketError.Success && socketError != SocketError.IOPending)
{
e.FinishOperationSyncFailure(socketError, bytesTransferred, flags);
retval = false;
}
else
{
retval = true;
}
if (NetEventSource.IsEnabled) NetEventSource.Exit(this, retval);
return retval;
}